There is a configuration settings: UIDefaultValueForSetChangedOnPublish, that you should be able to use to accomplish this in a EPiServer 7.5 site. This also gives the editor an option to unset this for specific content instances, for instance when just updating a spell change.

Linus, is this possible to accomplish on just one spesific page type? I.e with some kind of event? Seems like the properties SetChangedOnPublish and this[MetaDataProperties.PageChangedOnPublish] is read only.